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Thermodynamics of the Spin Luttinger Liquid in a Model Ladder Material

Authors
Kiefer, K.
Thielemann, B.
McMorrow, D. F.
Zapf, V.
Normand, B.
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Published in Physical Review Letters. 2008, vol. 101, no. 24
Abstract The phase diagram in temperature and magnetic field of the metal-organic, two-leg, spin-ladder compound (C5H12N)2CuBr4 is studied by measurements of the specific heat and the magnetocaloric effect. We demonstrate the presence of an extended spin Luttinger-liquid phase between two field-induced quantum critical points and over a broad range of temperature. Based on an ideal spin-ladder Hamiltonian, comprehensive numerical modeling of the ladder specific heat yields excellent quantitative agreement with the experimental data across the entire phase diagram.
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RUEGG, Christian et al. Thermodynamics of the Spin Luttinger Liquid in a Model Ladder Material. In: Physical Review Letters, 2008, vol. 101, n° 24. https://archive-ouverte.unige.ch/unige:36044

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Deposited on : 2014-04-28

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